HP-75 Designations?

[Steve Simpkin]

(12-28-2020 02:27 AM)toml_12953 Wrote:  I see ads for HP-75 C and D. Are there only those two? What are the differences? Which is the most powerful of the HP-75 line or isn't there a difference in that regard?

From the HP Museum page for the HP-75C/D.
"The HP-75D added a wand and wand port." The HP-75C was introduced in 1982. The HP-75D came out in 1984. I don't know if there were any other differences other than the price.